American Dryer Corp. ML-145 - Manual (Page 30)

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To Replace Small Idler Pulley
1. Loosen V-belts. Rotate pulley and roll V-belts out of grooves.
2. Remove cap screws from the bushings.
3. Insert cap screws in tapped removal holes and tighten evenly until bushing
becomes loose on shaft. Refer to figure “A” on previous page.
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in figure “B.” When cap screws are
loosely inserted, bushing remains fully expanded to provide a sliding fit on the
shaft.
6. Insert key on the shaft, then slide sheave to desired position with cap screw
heads to the outside.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the
bushing.
IMPORTANT: Tighten screws evenly and progressively. Never allow the sheave to be drawn in
contact with the flange of the bushing. This gap should measure from 1/8” to 1/4”.
Proper cap screw torque is 6 ft-lbs. (8 Nm), if greater tightening forces are applied,
excess pressures will be created in the hub of the mounted sheave which may cause it
to crack.
To Replace Large Idler Pulley
1. Loosen V-belts. Then, rotate pulley and roll
V-belts out of grooves.
2. Remove cap screws.
3. Insert cap screws in tapped removal holes
and tighten evenly until bushing becomes
loose on shaft. Refer to figure “A” on
previous page.
4. Remove bushing, pulley, and key.
5. Assemble bushing and sheave as shown in
figure “B.” When cap screws are loosely
inserted, bushing remains fully expanded
to provide a sliding fit on the shaft.
6. Insert key on the shaft, then slide sheave to desired position with cap screw heads to the outside.
7. Tighten cap screws progressively. There should remain a gap between the sheave hub and the flange of the
bushing.